1. (General) Something/Someone that is so good in a particular context that it eclipses saecond place.

2. (Games) A game object or facility that is too good to exist. It is so powerful that it is unbalancing and hence breaks the game. Every winning player has to use this to be competitive.

Entymology: The power cards from Magic The Gathering (Black Lotus, Time Walk, Ancestral Recall, all Moxen, etc) were so powerful and unbalancing that they were eventually banned from tournament play because they BROKE the game.

When referring to a pet cat or dog that's been "fixed", they're actually broken. I mean, think about it...when a pet has its cunt cut out or has its nads chopped off, it is no longer capable of doing something that it was rather easily able to before -- that is, make kittens or puppies!

Yeah, Nikki has been broken; she got spayed approx. nine years ago and can no longer have little baby kitties.